This module is just a translation of the C fcntl.h file.
Unlike the old mechanism which required a translated fcntl.ph
file, fcntl uses the h2xs program (see the Perl source distribution)
and your native C compiler. This means that it has a
much better chance of getting the numbers right.

Note that only #define symbols get translated; you must still correctly
pack up your own arguments to pass as arguments for locking functions and
so on.

The following routines are exported by default, and each routine returns the value
of the #define that is the same as the routine name: